Touch screen whiteboards are famous these days. Be it education, corporate workplaces or medical centers, they are seen everywhere. However, due to their popularity, a number of manufacturers have started producing them, thereby resulting in a large number of options for the customers.
Considering this, it is important to make the right choice depending on the needs. Again, there are various factors that can be taken into account while making the decision, like, usability, durability, user friendliness, damage resistance etc.
This article focuses on the different types of touch technologies used in the touch screen whiteboards and their merits and demerits, to help our customers make the right choice. So here they are:
1. Surface Capacitance
Surface Capacitance touch technology consists of an insulated screen (often transparent) which is covered with a conducting layer on one side and a small voltage is supplied between them. The other side is facing the user.
When the user touches the screen with his finger, a temporary capacitor is formed as the human body also carries the electric charge. This variance in the capacitor is measured by the sensor and the suitable response is generated.
Surface capacitance touch screens have a good image resolution quality and offer good resistance to external pollutants like liquids and dust. However, due to its capacitive nature, it can be operated only using a bare finger or charged stylus.
2. Projected Capacitance
Projected capacitance works on a similar principle as surface capacitance, but is better than that. It has a transparent insulating layer with a grid of conducting layers, along with an integrated circuit. This creates a three-dimensional electric field which is able to detect multiple touches at different locations simultaneously.
This type of touch screens are more durable and provide better image resolution than the surface capacitance. Not only this, it can be operated wearing gloves and is resistant to surface contaminants.
However, the major drawback is that it is sensitive to electromagnetic induction resulting in signal fluctuations.
3. Resistive Touch
Resistive touch is the most famous and widely used technology. It is also the cheapest. It consists of two conducting transparent layers with a thin separation between them. Both the surfaces are oppositely charged.
When the user touches the screen at some point, the two layers come in contact and the charge flow happens which is detected by the sensor and the response is generated.
The major advantage of this technology is that it can be operated with gloves or pens. It is resistant to surface pollutants and consumes low power. However, the image clarity is not that good and outer conducting layer is prone to damages.
4. Infrared Touch
Infrared touch technology is very different from the other types. It consists of infrared emitters and receivers on the four sides of the screen. This creates a fine grid of the infrared rays invisible to human eyes.
When a finger or any object touches the screen, the infrared grid is obstructed and the location of the touch, in coordinates, is accurately determined.
Due to this, it offers high image resolution as well as high durability. However, it is vulnerable to anything that can disturb or interfere with the infrared grid pattern resulting in errors and malfunction. It can be due to dust, liquids, snow or any accidental particles.
Various touch screen whiteboards using different touch technologies are available in the market. However, before making the choice the needs and the requirements should be kept in mind and decision should be made accordingly.
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